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FFmpeg/libswscale/utils.c

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  1. /*

  2.  * Copyright (C) 2001-2003 Michael Niedermayer <michaelni@gmx.at>

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

  6.  * FFmpeg is free software; you can redistribute it and/or

  7.  * modify it under the terms of the GNU Lesser General Public

  8.  * License as published by the Free Software Foundation; either

  9.  * version 2.1 of the License, or (at your option) any later version.

  10.  *

  11.  * FFmpeg is distributed in the hope that it will be useful,

  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  14.  * Lesser General Public License for more details.

  15.  *

  16.  * You should have received a copy of the GNU Lesser General Public

  17.  * License along with FFmpeg; if not, write to the Free Software

  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  19.  */

  20. 

  21. #include "config.h"

  22. 

  23. #define _SVID_SOURCE // needed for MAP_ANONYMOUS

  24. #define _DARWIN_C_SOURCE // needed for MAP_ANON

  25. #include <inttypes.h>

  26. #include <math.h>

  27. #include <stdio.h>

  28. #include <string.h>

  29. #if HAVE_SYS_MMAN_H

  30. #include <sys/mman.h>

  31. #if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)

  32. #define MAP_ANONYMOUS MAP_ANON

  33. #endif

  34. #endif

  35. #if HAVE_VIRTUALALLOC

  36. #define WIN32_LEAN_AND_MEAN

  37. #include <windows.h>

  38. #endif

  39. 

  40. #include "libavutil/attributes.h"

  41. #include "libavutil/avassert.h"

  42. #include "libavutil/avutil.h"

  43. #include "libavutil/bswap.h"

  44. #include "libavutil/cpu.h"

  45. #include "libavutil/intreadwrite.h"

  46. #include "libavutil/mathematics.h"

  47. #include "libavutil/opt.h"

  48. #include "libavutil/pixdesc.h"

  49. #include "libavutil/ppc/cpu.h"

  50. #include "libavutil/x86/asm.h"

  51. #include "libavutil/x86/cpu.h"

  52. #include "rgb2rgb.h"

  53. #include "swscale.h"

  54. #include "swscale_internal.h"

  55. 

  56. static void handle_formats(SwsContext *c);

  57. 

  58. unsigned swscale_version(void)

  59. {

  60.     av_assert0(LIBSWSCALE_VERSION_MICRO >= 100);

  61.     return LIBSWSCALE_VERSION_INT;

  62. }

  63. 

  64. const char *swscale_configuration(void)

  65. {

  66.     return FFMPEG_CONFIGURATION;

  67. }

  68. 

  69. const char *swscale_license(void)

  70. {

  71. #define LICENSE_PREFIX "libswscale license: "

  72.     return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;

  73. }

  74. 

  75. #define RET 0xC3 // near return opcode for x86

  76. 

  77. typedef struct FormatEntry {

  78.     uint8_t is_supported_in         :1;

  79.     uint8_t is_supported_out        :1;

  80.     uint8_t is_supported_endianness :1;

  81. } FormatEntry;

  82. 

  83. static const FormatEntry format_entries[AV_PIX_FMT_NB] = {

  84.     [AV_PIX_FMT_YUV420P]     = { 1, 1 },

  85.     [AV_PIX_FMT_YUYV422]     = { 1, 1 },

  86.     [AV_PIX_FMT_RGB24]       = { 1, 1 },

  87.     [AV_PIX_FMT_BGR24]       = { 1, 1 },

  88.     [AV_PIX_FMT_YUV422P]     = { 1, 1 },

  89.     [AV_PIX_FMT_YUV444P]     = { 1, 1 },

  90.     [AV_PIX_FMT_YUV410P]     = { 1, 1 },

  91.     [AV_PIX_FMT_YUV411P]     = { 1, 1 },

  92.     [AV_PIX_FMT_GRAY8]       = { 1, 1 },

  93.     [AV_PIX_FMT_MONOWHITE]   = { 1, 1 },

  94.     [AV_PIX_FMT_MONOBLACK]   = { 1, 1 },

  95.     [AV_PIX_FMT_PAL8]        = { 1, 0 },

  96.     [AV_PIX_FMT_YUVJ420P]    = { 1, 1 },

  97.     [AV_PIX_FMT_YUVJ411P]    = { 1, 1 },

  98.     [AV_PIX_FMT_YUVJ422P]    = { 1, 1 },

  99.     [AV_PIX_FMT_YUVJ444P]    = { 1, 1 },

  100.     [AV_PIX_FMT_UYVY422]     = { 1, 1 },

  101.     [AV_PIX_FMT_UYYVYY411]   = { 0, 0 },

  102.     [AV_PIX_FMT_BGR8]        = { 1, 1 },

  103.     [AV_PIX_FMT_BGR4]        = { 0, 1 },

  104.     [AV_PIX_FMT_BGR4_BYTE]   = { 1, 1 },

  105.     [AV_PIX_FMT_RGB8]        = { 1, 1 },

  106.     [AV_PIX_FMT_RGB4]        = { 0, 1 },

  107.     [AV_PIX_FMT_RGB4_BYTE]   = { 1, 1 },

  108.     [AV_PIX_FMT_NV12]        = { 1, 1 },

  109.     [AV_PIX_FMT_NV21]        = { 1, 1 },

  110.     [AV_PIX_FMT_ARGB]        = { 1, 1 },

  111.     [AV_PIX_FMT_RGBA]        = { 1, 1 },

  112.     [AV_PIX_FMT_ABGR]        = { 1, 1 },

  113.     [AV_PIX_FMT_BGRA]        = { 1, 1 },

  114.     [AV_PIX_FMT_0RGB]        = { 1, 1 },

  115.     [AV_PIX_FMT_RGB0]        = { 1, 1 },

  116.     [AV_PIX_FMT_0BGR]        = { 1, 1 },

  117.     [AV_PIX_FMT_BGR0]        = { 1, 1 },

  118.     [AV_PIX_FMT_GRAY16BE]    = { 1, 1 },

  119.     [AV_PIX_FMT_GRAY16LE]    = { 1, 1 },

  120.     [AV_PIX_FMT_YUV440P]     = { 1, 1 },

  121.     [AV_PIX_FMT_YUVJ440P]    = { 1, 1 },

  122.     [AV_PIX_FMT_YUVA420P]    = { 1, 1 },

  123.     [AV_PIX_FMT_YUVA422P]    = { 1, 1 },

  124.     [AV_PIX_FMT_YUVA444P]    = { 1, 1 },

  125.     [AV_PIX_FMT_YUVA420P9BE] = { 1, 1 },

  126.     [AV_PIX_FMT_YUVA420P9LE] = { 1, 1 },

  127.     [AV_PIX_FMT_YUVA422P9BE] = { 1, 1 },

  128.     [AV_PIX_FMT_YUVA422P9LE] = { 1, 1 },

  129.     [AV_PIX_FMT_YUVA444P9BE] = { 1, 1 },

  130.     [AV_PIX_FMT_YUVA444P9LE] = { 1, 1 },

  131.     [AV_PIX_FMT_YUVA420P10BE]= { 1, 1 },

  132.     [AV_PIX_FMT_YUVA420P10LE]= { 1, 1 },

  133.     [AV_PIX_FMT_YUVA422P10BE]= { 1, 1 },

  134.     [AV_PIX_FMT_YUVA422P10LE]= { 1, 1 },

  135.     [AV_PIX_FMT_YUVA444P10BE]= { 1, 1 },

  136.     [AV_PIX_FMT_YUVA444P10LE]= { 1, 1 },

  137.     [AV_PIX_FMT_YUVA420P16BE]= { 1, 1 },

  138.     [AV_PIX_FMT_YUVA420P16LE]= { 1, 1 },

  139.     [AV_PIX_FMT_YUVA422P16BE]= { 1, 1 },

  140.     [AV_PIX_FMT_YUVA422P16LE]= { 1, 1 },

  141.     [AV_PIX_FMT_YUVA444P16BE]= { 1, 1 },

  142.     [AV_PIX_FMT_YUVA444P16LE]= { 1, 1 },

  143.     [AV_PIX_FMT_RGB48BE]     = { 1, 1 },

  144.     [AV_PIX_FMT_RGB48LE]     = { 1, 1 },

  145.     [AV_PIX_FMT_RGBA64BE]    = { 1, 1, 1 },

  146.     [AV_PIX_FMT_RGBA64LE]    = { 1, 1, 1 },

  147.     [AV_PIX_FMT_RGB565BE]    = { 1, 1 },

  148.     [AV_PIX_FMT_RGB565LE]    = { 1, 1 },

  149.     [AV_PIX_FMT_RGB555BE]    = { 1, 1 },

  150.     [AV_PIX_FMT_RGB555LE]    = { 1, 1 },

  151.     [AV_PIX_FMT_BGR565BE]    = { 1, 1 },

  152.     [AV_PIX_FMT_BGR565LE]    = { 1, 1 },

  153.     [AV_PIX_FMT_BGR555BE]    = { 1, 1 },

  154.     [AV_PIX_FMT_BGR555LE]    = { 1, 1 },

  155.     [AV_PIX_FMT_YUV420P16LE] = { 1, 1 },

  156.     [AV_PIX_FMT_YUV420P16BE] = { 1, 1 },

  157.     [AV_PIX_FMT_YUV422P16LE] = { 1, 1 },

  158.     [AV_PIX_FMT_YUV422P16BE] = { 1, 1 },

  159.     [AV_PIX_FMT_YUV444P16LE] = { 1, 1 },

  160.     [AV_PIX_FMT_YUV444P16BE] = { 1, 1 },

  161.     [AV_PIX_FMT_RGB444LE]    = { 1, 1 },

  162.     [AV_PIX_FMT_RGB444BE]    = { 1, 1 },

  163.     [AV_PIX_FMT_BGR444LE]    = { 1, 1 },

  164.     [AV_PIX_FMT_BGR444BE]    = { 1, 1 },

  165.     [AV_PIX_FMT_Y400A]       = { 1, 0 },

  166.     [AV_PIX_FMT_BGR48BE]     = { 1, 1 },

  167.     [AV_PIX_FMT_BGR48LE]     = { 1, 1 },

  168.     [AV_PIX_FMT_BGRA64BE]    = { 1, 1, 1 },

  169.     [AV_PIX_FMT_BGRA64LE]    = { 1, 1, 1 },

  170.     [AV_PIX_FMT_YUV420P9BE]  = { 1, 1 },

  171.     [AV_PIX_FMT_YUV420P9LE]  = { 1, 1 },

  172.     [AV_PIX_FMT_YUV420P10BE] = { 1, 1 },

  173.     [AV_PIX_FMT_YUV420P10LE] = { 1, 1 },

  174.     [AV_PIX_FMT_YUV420P12BE] = { 1, 1 },

  175.     [AV_PIX_FMT_YUV420P12LE] = { 1, 1 },

  176.     [AV_PIX_FMT_YUV420P14BE] = { 1, 1 },

  177.     [AV_PIX_FMT_YUV420P14LE] = { 1, 1 },

  178.     [AV_PIX_FMT_YUV422P9BE]  = { 1, 1 },

  179.     [AV_PIX_FMT_YUV422P9LE]  = { 1, 1 },

  180.     [AV_PIX_FMT_YUV422P10BE] = { 1, 1 },

  181.     [AV_PIX_FMT_YUV422P10LE] = { 1, 1 },

  182.     [AV_PIX_FMT_YUV422P12BE] = { 1, 1 },

  183.     [AV_PIX_FMT_YUV422P12LE] = { 1, 1 },

  184.     [AV_PIX_FMT_YUV422P14BE] = { 1, 1 },

  185.     [AV_PIX_FMT_YUV422P14LE] = { 1, 1 },

  186.     [AV_PIX_FMT_YUV444P9BE]  = { 1, 1 },

  187.     [AV_PIX_FMT_YUV444P9LE]  = { 1, 1 },

  188.     [AV_PIX_FMT_YUV444P10BE] = { 1, 1 },

  189.     [AV_PIX_FMT_YUV444P10LE] = { 1, 1 },

  190.     [AV_PIX_FMT_YUV444P12BE] = { 1, 1 },

  191.     [AV_PIX_FMT_YUV444P12LE] = { 1, 1 },

  192.     [AV_PIX_FMT_YUV444P14BE] = { 1, 1 },

  193.     [AV_PIX_FMT_YUV444P14LE] = { 1, 1 },

  194.     [AV_PIX_FMT_GBRP]        = { 1, 1 },

  195.     [AV_PIX_FMT_GBRP9LE]     = { 1, 1 },

  196.     [AV_PIX_FMT_GBRP9BE]     = { 1, 1 },

  197.     [AV_PIX_FMT_GBRP10LE]    = { 1, 1 },

  198.     [AV_PIX_FMT_GBRP10BE]    = { 1, 1 },

  199.     [AV_PIX_FMT_GBRP12LE]    = { 1, 1 },

  200.     [AV_PIX_FMT_GBRP12BE]    = { 1, 1 },

  201.     [AV_PIX_FMT_GBRP14LE]    = { 1, 1 },

  202.     [AV_PIX_FMT_GBRP14BE]    = { 1, 1 },

  203.     [AV_PIX_FMT_GBRP16LE]    = { 1, 0 },

  204.     [AV_PIX_FMT_GBRP16BE]    = { 1, 0 },

  205.     [AV_PIX_FMT_XYZ12BE]     = { 1, 1, 1 },

  206.     [AV_PIX_FMT_XYZ12LE]     = { 1, 1, 1 },

  207.     [AV_PIX_FMT_GBRAP]       = { 1, 1 },

  208.     [AV_PIX_FMT_GBRAP16LE]   = { 1, 0 },

  209.     [AV_PIX_FMT_GBRAP16BE]   = { 1, 0 },

  210.     [AV_PIX_FMT_BAYER_BGGR8] = { 1, 0 },

  211.     [AV_PIX_FMT_BAYER_RGGB8] = { 1, 0 },

  212.     [AV_PIX_FMT_BAYER_GBRG8] = { 1, 0 },

  213.     [AV_PIX_FMT_BAYER_GRBG8] = { 1, 0 },

  214.     [AV_PIX_FMT_BAYER_BGGR16LE] = { 1, 0 },

  215.     [AV_PIX_FMT_BAYER_BGGR16BE] = { 1, 0 },

  216.     [AV_PIX_FMT_BAYER_RGGB16LE] = { 1, 0 },

  217.     [AV_PIX_FMT_BAYER_RGGB16BE] = { 1, 0 },

  218.     [AV_PIX_FMT_BAYER_GBRG16LE] = { 1, 0 },

  219.     [AV_PIX_FMT_BAYER_GBRG16BE] = { 1, 0 },

  220.     [AV_PIX_FMT_BAYER_GRBG16LE] = { 1, 0 },

  221.     [AV_PIX_FMT_BAYER_GRBG16BE] = { 1, 0 },

  222. };

  223. 

  224. int sws_isSupportedInput(enum AVPixelFormat pix_fmt)

  225. {

  226.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  227.            format_entries[pix_fmt].is_supported_in : 0;

  228. }

  229. 

  230. int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)

  231. {

  232.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  233.            format_entries[pix_fmt].is_supported_out : 0;

  234. }

  235. 

  236. int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)

  237. {

  238.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  239.            format_entries[pix_fmt].is_supported_endianness : 0;

  240. }

  241. 

  242. #if FF_API_SWS_FORMAT_NAME

  243. const char *sws_format_name(enum AVPixelFormat format)

  244. {

  245.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(format);

  246.     if (desc)

  247.         return desc->name;

  248.     else

  249.         return "Unknown format";

  250. }

  251. #endif

  252. 

  253. static double getSplineCoeff(double a, double b, double c, double d,

  254.                              double dist)

  255. {

  256.     if (dist <= 1.0)

  257.         return ((d * dist + c) * dist + b) * dist + a;

  258.     else

  259.         return getSplineCoeff(0.0,

  260.                                b + 2.0 * c + 3.0 * d,

  261.                                c + 3.0 * d,

  262.                               -b - 3.0 * c - 6.0 * d,

  263.                               dist - 1.0);

  264. }

  265. 

  266. static av_cold int get_local_pos(SwsContext *s, int chr_subsample, int pos, int dir)

  267. {

  268.     if (pos < 0) {

  269.         pos = (128 << chr_subsample) - 128;

  270.     }

  271.     pos += 128; // relative to ideal left edge

  272.     return pos >> chr_subsample;

  273. }

  274. 

  275. typedef struct {

  276.     int flag;                   ///< flag associated to the algorithm

  277.     const char *description;    ///< human-readable description

  278.     int size_factor;            ///< size factor used when initing the filters

  279. } ScaleAlgorithm;

  280. 

  281. static const ScaleAlgorithm scale_algorithms[] = {

  282.     { SWS_AREA,          "area averaging",                  1 /* downscale only, for upscale it is bilinear */ },

  283.     { SWS_BICUBIC,       "bicubic",                         4 },

  284.     { SWS_BICUBLIN,      "luma bicubic / chroma bilinear", -1 },

  285.     { SWS_BILINEAR,      "bilinear",                        2 },

  286.     { SWS_FAST_BILINEAR, "fast bilinear",                  -1 },

  287.     { SWS_GAUSS,         "Gaussian",                        8 /* infinite ;) */ },

  288.     { SWS_LANCZOS,       "Lanczos",                        -1 /* custom */ },

  289.     { SWS_POINT,         "nearest neighbor / point",       -1 },

  290.     { SWS_SINC,          "sinc",                           20 /* infinite ;) */ },

  291.     { SWS_SPLINE,        "bicubic spline",                 20 /* infinite :)*/ },

  292.     { SWS_X,             "experimental",                    8 },

  293. };

  294. 

  295. static av_cold int initFilter(int16_t **outFilter, int32_t **filterPos,

  296.                               int *outFilterSize, int xInc, int srcW,

  297.                               int dstW, int filterAlign, int one,

  298.                               int flags, int cpu_flags,

  299.                               SwsVector *srcFilter, SwsVector *dstFilter,

  300.                               double param[2], int srcPos, int dstPos)

  301. {

  302.     int i;

  303.     int filterSize;

  304.     int filter2Size;

  305.     int minFilterSize;

  306.     int64_t *filter    = NULL;

  307.     int64_t *filter2   = NULL;

  308.     const int64_t fone = 1LL << (54 - FFMIN(av_log2(srcW/dstW), 8));

  309.     int ret            = -1;

  310. 

  311.     emms_c(); // FIXME should not be required but IS (even for non-MMX versions)

  312. 

  313.     // NOTE: the +3 is for the MMX(+1) / SSE(+3) scaler which reads over the end

  314.     FF_ALLOC_OR_GOTO(NULL, *filterPos, (dstW + 3) * sizeof(**filterPos), fail);

  315. 

  316.     if (FFABS(xInc - 0x10000) < 10 && srcPos == dstPos) { // unscaled

  317.         int i;

  318.         filterSize = 1;

  319.         FF_ALLOCZ_OR_GOTO(NULL, filter,

  320.                           dstW * sizeof(*filter) * filterSize, fail);

  321. 

  322.         for (i = 0; i < dstW; i++) {

  323.             filter[i * filterSize] = fone;

  324.             (*filterPos)[i]        = i;

  325.         }

  326.     } else if (flags & SWS_POINT) { // lame looking point sampling mode

  327.         int i;

  328.         int64_t xDstInSrc;

  329.         filterSize = 1;

  330.         FF_ALLOC_OR_GOTO(NULL, filter,

  331.                          dstW * sizeof(*filter) * filterSize, fail);

  332. 

  333.         xDstInSrc = ((dstPos*(int64_t)xInc)>>8) - ((srcPos*0x8000LL)>>7);

  334.         for (i = 0; i < dstW; i++) {

  335.             int xx = (xDstInSrc - ((filterSize - 1) << 15) + (1 << 15)) >> 16;

  336. 

  337.             (*filterPos)[i] = xx;

  338.             filter[i]       = fone;

  339.             xDstInSrc      += xInc;

  340.         }

  341.     } else if ((xInc <= (1 << 16) && (flags & SWS_AREA)) ||

  342.                (flags & SWS_FAST_BILINEAR)) { // bilinear upscale

  343.         int i;

  344.         int64_t xDstInSrc;

  345.         filterSize = 2;

  346.         FF_ALLOC_OR_GOTO(NULL, filter,

  347.                          dstW * sizeof(*filter) * filterSize, fail);

  348. 

  349.         xDstInSrc = ((dstPos*(int64_t)xInc)>>8) - ((srcPos*0x8000LL)>>7);

  350.         for (i = 0; i < dstW; i++) {

  351.             int xx = (xDstInSrc - ((filterSize - 1) << 15) + (1 << 15)) >> 16;

  352.             int j;

  353. 

  354.             (*filterPos)[i] = xx;

  355.             // bilinear upscale / linear interpolate / area averaging

  356.             for (j = 0; j < filterSize; j++) {

  357.                 int64_t coeff= fone - FFABS(((int64_t)xx<<16) - xDstInSrc)*(fone>>16);

  358.                 if (coeff < 0)

  359.                     coeff = 0;

  360.                 filter[i * filterSize + j] = coeff;

  361.                 xx++;

  362.             }

  363.             xDstInSrc += xInc;

  364.         }

  365.     } else {

  366.         int64_t xDstInSrc;

  367.         int sizeFactor = -1;

  368. 

  369.         for (i = 0; i < FF_ARRAY_ELEMS(scale_algorithms); i++) {

  370.             if (flags & scale_algorithms[i].flag && scale_algorithms[i].size_factor > 0) {

  371.                 sizeFactor = scale_algorithms[i].size_factor;

  372.                 break;

  373.             }

  374.         }

  375.         if (flags & SWS_LANCZOS)

  376.             sizeFactor = param[0] != SWS_PARAM_DEFAULT ? ceil(2 * param[0]) : 6;

  377.         av_assert0(sizeFactor > 0);

  378. 

  379.         if (xInc <= 1 << 16)

  380.             filterSize = 1 + sizeFactor;    // upscale

  381.         else

  382.             filterSize = 1 + (sizeFactor * srcW + dstW - 1) / dstW;

  383. 

  384.         filterSize = FFMIN(filterSize, srcW - 2);

  385.         filterSize = FFMAX(filterSize, 1);

  386. 

  387.         FF_ALLOC_OR_GOTO(NULL, filter,

  388.                          dstW * sizeof(*filter) * filterSize, fail);

  389. 

  390.         xDstInSrc = ((dstPos*(int64_t)xInc)>>7) - ((srcPos*0x10000LL)>>7);

  391.         for (i = 0; i < dstW; i++) {

  392.             int xx = (xDstInSrc - ((filterSize - 2) << 16)) / (1 << 17);

  393.             int j;

  394.             (*filterPos)[i] = xx;

  395.             for (j = 0; j < filterSize; j++) {

  396.                 int64_t d = (FFABS(((int64_t)xx << 17) - xDstInSrc)) << 13;

  397.                 double floatd;

  398.                 int64_t coeff;

  399. 

  400.                 if (xInc > 1 << 16)

  401.                     d = d * dstW / srcW;

  402.                 floatd = d * (1.0 / (1 << 30));

  403. 

  404.                 if (flags & SWS_BICUBIC) {

  405.                     int64_t B = (param[0] != SWS_PARAM_DEFAULT ? param[0] :   0) * (1 << 24);

  406.                     int64_t C = (param[1] != SWS_PARAM_DEFAULT ? param[1] : 0.6) * (1 << 24);

  407. 

  408.                     if (d >= 1LL << 31) {

  409.                         coeff = 0.0;

  410.                     } else {

  411.                         int64_t dd  = (d  * d) >> 30;

  412.                         int64_t ddd = (dd * d) >> 30;

  413. 

  414.                         if (d < 1LL << 30)

  415.                             coeff =  (12 * (1 << 24) -  9 * B - 6 * C) * ddd +

  416.                                     (-18 * (1 << 24) + 12 * B + 6 * C) *  dd +

  417.                                       (6 * (1 << 24) -  2 * B)         * (1 << 30);

  418.                         else

  419.                             coeff =      (-B -  6 * C) * ddd +

  420.                                       (6 * B + 30 * C) * dd  +

  421.                                     (-12 * B - 48 * C) * d   +

  422.                                       (8 * B + 24 * C) * (1 << 30);

  423.                     }

  424.                     coeff /= (1LL<<54)/fone;

  425.                 }

  426. #if 0

  427.                 else if (flags & SWS_X) {

  428.                     double p  = param ? param * 0.01 : 0.3;

  429.                     coeff     = d ? sin(d * M_PI) / (d * M_PI) : 1.0;

  430.                     coeff    *= pow(2.0, -p * d * d);

  431.                 }

  432. #endif

  433.                 else if (flags & SWS_X) {

  434.                     double A = param[0] != SWS_PARAM_DEFAULT ? param[0] : 1.0;

  435.                     double c;

  436. 

  437.                     if (floatd < 1.0)

  438.                         c = cos(floatd * M_PI);

  439.                     else

  440.                         c = -1.0;

  441.                     if (c < 0.0)

  442.                         c = -pow(-c, A);

  443.                     else

  444.                         c = pow(c, A);

  445.                     coeff = (c * 0.5 + 0.5) * fone;

  446.                 } else if (flags & SWS_AREA) {

  447.                     int64_t d2 = d - (1 << 29);

  448.                     if (d2 * xInc < -(1LL << (29 + 16)))

  449.                         coeff = 1.0 * (1LL << (30 + 16));

  450.                     else if (d2 * xInc < (1LL << (29 + 16)))

  451.                         coeff = -d2 * xInc + (1LL << (29 + 16));

  452.                     else

  453.                         coeff = 0.0;

  454.                     coeff *= fone >> (30 + 16);

  455.                 } else if (flags & SWS_GAUSS) {

  456.                     double p = param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;

  457.                     coeff = (pow(2.0, -p * floatd * floatd)) * fone;

  458.                 } else if (flags & SWS_SINC) {

  459.                     coeff = (d ? sin(floatd * M_PI) / (floatd * M_PI) : 1.0) * fone;

  460.                 } else if (flags & SWS_LANCZOS) {

  461.                     double p = param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;

  462.                     coeff = (d ? sin(floatd * M_PI) * sin(floatd * M_PI / p) /

  463.                              (floatd * floatd * M_PI * M_PI / p) : 1.0) * fone;

  464.                     if (floatd > p)

  465.                         coeff = 0;

  466.                 } else if (flags & SWS_BILINEAR) {

  467.                     coeff = (1 << 30) - d;

  468.                     if (coeff < 0)

  469.                         coeff = 0;

  470.                     coeff *= fone >> 30;

  471.                 } else if (flags & SWS_SPLINE) {

  472.                     double p = -2.196152422706632;

  473.                     coeff = getSplineCoeff(1.0, 0.0, p, -p - 1.0, floatd) * fone;

  474.                 } else {

  475.                     av_assert0(0);

  476.                 }

  477. 

  478.                 filter[i * filterSize + j] = coeff;

  479.                 xx++;

  480.             }

  481.             xDstInSrc += 2 * xInc;

  482.         }

  483.     }

  484. 

  485.     /* apply src & dst Filter to filter -> filter2

  486.      * av_free(filter);

  487.      */

  488.     av_assert0(filterSize > 0);

  489.     filter2Size = filterSize;

  490.     if (srcFilter)

  491.         filter2Size += srcFilter->length - 1;

  492.     if (dstFilter)

  493.         filter2Size += dstFilter->length - 1;

  494.     av_assert0(filter2Size > 0);

  495.     FF_ALLOCZ_OR_GOTO(NULL, filter2, filter2Size * dstW * sizeof(*filter2), fail);

  496. 

  497.     for (i = 0; i < dstW; i++) {

  498.         int j, k;

  499. 

  500.         if (srcFilter) {

  501.             for (k = 0; k < srcFilter->length; k++) {

  502.                 for (j = 0; j < filterSize; j++)

  503.                     filter2[i * filter2Size + k + j] +=

  504.                         srcFilter->coeff[k] * filter[i * filterSize + j];

  505.             }

  506.         } else {

  507.             for (j = 0; j < filterSize; j++)

  508.                 filter2[i * filter2Size + j] = filter[i * filterSize + j];

  509.         }

  510.         // FIXME dstFilter

  511. 

  512.         (*filterPos)[i] += (filterSize - 1) / 2 - (filter2Size - 1) / 2;

  513.     }

  514.     av_freep(&filter);

  515. 

  516.     /* try to reduce the filter-size (step1 find size and shift left) */

  517.     // Assume it is near normalized (*0.5 or *2.0 is OK but * 0.001 is not).

  518.     minFilterSize = 0;

  519.     for (i = dstW - 1; i >= 0; i--) {

  520.         int min = filter2Size;

  521.         int j;

  522.         int64_t cutOff = 0.0;

  523. 

  524.         /* get rid of near zero elements on the left by shifting left */

  525.         for (j = 0; j < filter2Size; j++) {

  526.             int k;

  527.             cutOff += FFABS(filter2[i * filter2Size]);

  528. 

  529.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  530.                 break;

  531. 

  532.             /* preserve monotonicity because the core can't handle the

  533.              * filter otherwise */

  534.             if (i < dstW - 1 && (*filterPos)[i] >= (*filterPos)[i + 1])

  535.                 break;

  536. 

  537.             // move filter coefficients left

  538.             for (k = 1; k < filter2Size; k++)

  539.                 filter2[i * filter2Size + k - 1] = filter2[i * filter2Size + k];

  540.             filter2[i * filter2Size + k - 1] = 0;

  541.             (*filterPos)[i]++;

  542.         }

  543. 

  544.         cutOff = 0;

  545.         /* count near zeros on the right */

  546.         for (j = filter2Size - 1; j > 0; j--) {

  547.             cutOff += FFABS(filter2[i * filter2Size + j]);

  548. 

  549.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  550.                 break;

  551.             min--;

  552.         }

  553. 

  554.         if (min > minFilterSize)

  555.             minFilterSize = min;

  556.     }

  557. 

  558.     if (PPC_ALTIVEC(cpu_flags)) {

  559.         // we can handle the special case 4, so we don't want to go the full 8

  560.         if (minFilterSize < 5)

  561.             filterAlign = 4;

  562. 

  563.         /* We really don't want to waste our time doing useless computation, so

  564.          * fall back on the scalar C code for very small filters.

  565.          * Vectorizing is worth it only if you have a decent-sized vector. */

  566.         if (minFilterSize < 3)

  567.             filterAlign = 1;

  568.     }

  569. 

  570.     if (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) {

  571.         // special case for unscaled vertical filtering

  572.         if (minFilterSize == 1 && filterAlign == 2)

  573.             filterAlign = 1;

  574.     }

  575. 

  576.     av_assert0(minFilterSize > 0);

  577.     filterSize = (minFilterSize + (filterAlign - 1)) & (~(filterAlign - 1));

  578.     av_assert0(filterSize > 0);

  579.     filter = av_malloc(filterSize * dstW * sizeof(*filter));

  580.     if (!filter)

  581.         goto fail;

  582.     if (filterSize >= MAX_FILTER_SIZE * 16 /

  583.                       ((flags & SWS_ACCURATE_RND) ? APCK_SIZE : 16)) {

  584.         av_log(NULL, AV_LOG_ERROR, "sws: filterSize %d is too large, try less extreme scaling or increase MAX_FILTER_SIZE and recompile\n",

  585.                FF_CEIL_RSHIFT((filterSize+1) * ((flags & SWS_ACCURATE_RND) ? APCK_SIZE : 16), 4));

  586.         goto fail;

  587.     }

  588.     *outFilterSize = filterSize;

  589. 

  590.     if (flags & SWS_PRINT_INFO)

  591.         av_log(NULL, AV_LOG_VERBOSE,

  592.                "SwScaler: reducing / aligning filtersize %d -> %d\n",

  593.                filter2Size, filterSize);

  594.     /* try to reduce the filter-size (step2 reduce it) */

  595.     for (i = 0; i < dstW; i++) {

  596.         int j;

  597. 

  598.         for (j = 0; j < filterSize; j++) {

  599.             if (j >= filter2Size)

  600.                 filter[i * filterSize + j] = 0;

  601.             else

  602.                 filter[i * filterSize + j] = filter2[i * filter2Size + j];

  603.             if ((flags & SWS_BITEXACT) && j >= minFilterSize)

  604.                 filter[i * filterSize + j] = 0;

  605.         }

  606.     }

  607. 

  608.     // FIXME try to align filterPos if possible

  609. 

  610.     // fix borders

  611.     for (i = 0; i < dstW; i++) {

  612.         int j;

  613.         if ((*filterPos)[i] < 0) {

  614.             // move filter coefficients left to compensate for filterPos

  615.             for (j = 1; j < filterSize; j++) {

  616.                 int left = FFMAX(j + (*filterPos)[i], 0);

  617.                 filter[i * filterSize + left] += filter[i * filterSize + j];

  618.                 filter[i * filterSize + j]     = 0;

  619.             }

  620.             (*filterPos)[i]= 0;

  621.         }

  622. 

  623.         if ((*filterPos)[i] + filterSize > srcW) {

  624.             int shift = (*filterPos)[i] + filterSize - srcW;

  625.             // move filter coefficients right to compensate for filterPos

  626.             for (j = filterSize - 2; j >= 0; j--) {

  627.                 int right = FFMIN(j + shift, filterSize - 1);

  628.                 filter[i * filterSize + right] += filter[i * filterSize + j];

  629.                 filter[i * filterSize + j]      = 0;

  630.             }

  631.             (*filterPos)[i]= srcW - filterSize;

  632.         }

  633.     }

  634. 

  635.     // Note the +1 is for the MMX scaler which reads over the end

  636.     /* align at 16 for AltiVec (needed by hScale_altivec_real) */

  637.     FF_ALLOCZ_OR_GOTO(NULL, *outFilter,

  638.                       *outFilterSize * (dstW + 3) * sizeof(int16_t), fail);

  639. 

  640.     /* normalize & store in outFilter */

  641.     for (i = 0; i < dstW; i++) {

  642.         int j;

  643.         int64_t error = 0;

  644.         int64_t sum   = 0;

  645. 

  646.         for (j = 0; j < filterSize; j++) {

  647.             sum += filter[i * filterSize + j];

  648.         }

  649.         sum = (sum + one / 2) / one;

  650.         if (!sum) {

  651.             av_log(NULL, AV_LOG_WARNING, "SwScaler: zero vector in scaling\n");

  652.             sum = 1;

  653.         }

  654.         for (j = 0; j < *outFilterSize; j++) {

  655.             int64_t v = filter[i * filterSize + j] + error;

  656.             int intV  = ROUNDED_DIV(v, sum);

  657.             (*outFilter)[i * (*outFilterSize) + j] = intV;

  658.             error                                  = v - intV * sum;

  659.         }

  660.     }

  661. 

  662.     (*filterPos)[dstW + 0] =

  663.     (*filterPos)[dstW + 1] =

  664.     (*filterPos)[dstW + 2] = (*filterPos)[dstW - 1]; /* the MMX/SSE scaler will

  665.                                                       * read over the end */

  666.     for (i = 0; i < *outFilterSize; i++) {

  667.         int k = (dstW - 1) * (*outFilterSize) + i;

  668.         (*outFilter)[k + 1 * (*outFilterSize)] =

  669.         (*outFilter)[k + 2 * (*outFilterSize)] =

  670.         (*outFilter)[k + 3 * (*outFilterSize)] = (*outFilter)[k];

  671.     }

  672. 

  673.     ret = 0;

  674. 

  675. fail:

  676.     if(ret < 0)

  677.         av_log(NULL, AV_LOG_ERROR, "sws: initFilter failed\n");

  678.     av_free(filter);

  679.     av_free(filter2);

  680.     return ret;

  681. }

  682. 

  683. #if HAVE_MMXEXT_INLINE

  684. static av_cold int init_hscaler_mmxext(int dstW, int xInc, uint8_t *filterCode,

  685.                                        int16_t *filter, int32_t *filterPos,

  686.                                        int numSplits)

  687. {

  688.     uint8_t *fragmentA;

  689.     x86_reg imm8OfPShufW1A;

  690.     x86_reg imm8OfPShufW2A;

  691.     x86_reg fragmentLengthA;

  692.     uint8_t *fragmentB;

  693.     x86_reg imm8OfPShufW1B;

  694.     x86_reg imm8OfPShufW2B;

  695.     x86_reg fragmentLengthB;

  696.     int fragmentPos;

  697. 

  698.     int xpos, i;

  699. 

  700.     // create an optimized horizontal scaling routine

  701.     /* This scaler is made of runtime-generated MMXEXT code using specially tuned

  702.      * pshufw instructions. For every four output pixels, if four input pixels

  703.      * are enough for the fast bilinear scaling, then a chunk of fragmentB is

  704.      * used. If five input pixels are needed, then a chunk of fragmentA is used.

  705.      */

  706. 

  707.     // code fragment

  708. 

  709.     __asm__ volatile (

  710.         "jmp                         9f                 \n\t"

  711.         // Begin

  712.         "0:                                             \n\t"

  713.         "movq    (%%"REG_d", %%"REG_a"), %%mm3          \n\t"

  714.         "movd    (%%"REG_c", %%"REG_S"), %%mm0          \n\t"

  715.         "movd   1(%%"REG_c", %%"REG_S"), %%mm1          \n\t"

  716.         "punpcklbw                %%mm7, %%mm1          \n\t"

  717.         "punpcklbw                %%mm7, %%mm0          \n\t"

  718.         "pshufw                   $0xFF, %%mm1, %%mm1   \n\t"

  719.         "1:                                             \n\t"

  720.         "pshufw                   $0xFF, %%mm0, %%mm0   \n\t"

  721.         "2:                                             \n\t"

  722.         "psubw                    %%mm1, %%mm0          \n\t"

  723.         "movl   8(%%"REG_b", %%"REG_a"), %%esi          \n\t"

  724.         "pmullw                   %%mm3, %%mm0          \n\t"

  725.         "psllw                       $7, %%mm1          \n\t"

  726.         "paddw                    %%mm1, %%mm0          \n\t"

  727. 

  728.         "movq                     %%mm0, (%%"REG_D", %%"REG_a") \n\t"

  729. 

  730.         "add                         $8, %%"REG_a"      \n\t"

  731.         // End

  732.         "9:                                             \n\t"

  733.         // "int $3                                         \n\t"

  734.         "lea       " LOCAL_MANGLE(0b) ", %0             \n\t"

  735.         "lea       " LOCAL_MANGLE(1b) ", %1             \n\t"

  736.         "lea       " LOCAL_MANGLE(2b) ", %2             \n\t"

  737.         "dec                         %1                 \n\t"

  738.         "dec                         %2                 \n\t"

  739.         "sub                         %0, %1             \n\t"

  740.         "sub                         %0, %2             \n\t"

  741.         "lea       " LOCAL_MANGLE(9b) ", %3             \n\t"

  742.         "sub                         %0, %3             \n\t"

  743. 

  744. 

  745.         : "=r" (fragmentA), "=r" (imm8OfPShufW1A), "=r" (imm8OfPShufW2A),

  746.           "=r" (fragmentLengthA)

  747.         );

  748. 

  749.     __asm__ volatile (

  750.         "jmp                         9f                 \n\t"

  751.         // Begin

  752.         "0:                                             \n\t"

  753.         "movq    (%%"REG_d", %%"REG_a"), %%mm3          \n\t"

  754.         "movd    (%%"REG_c", %%"REG_S"), %%mm0          \n\t"

  755.         "punpcklbw                %%mm7, %%mm0          \n\t"

  756.         "pshufw                   $0xFF, %%mm0, %%mm1   \n\t"

  757.         "1:                                             \n\t"

  758.         "pshufw                   $0xFF, %%mm0, %%mm0   \n\t"

  759.         "2:                                             \n\t"

  760.         "psubw                    %%mm1, %%mm0          \n\t"

  761.         "movl   8(%%"REG_b", %%"REG_a"), %%esi          \n\t"

  762.         "pmullw                   %%mm3, %%mm0          \n\t"

  763.         "psllw                       $7, %%mm1          \n\t"

  764.         "paddw                    %%mm1, %%mm0          \n\t"

  765. 

  766.         "movq                     %%mm0, (%%"REG_D", %%"REG_a") \n\t"

  767. 

  768.         "add                         $8, %%"REG_a"      \n\t"

  769.         // End

  770.         "9:                                             \n\t"

  771.         // "int                       $3                   \n\t"

  772.         "lea       " LOCAL_MANGLE(0b) ", %0             \n\t"

  773.         "lea       " LOCAL_MANGLE(1b) ", %1             \n\t"

  774.         "lea       " LOCAL_MANGLE(2b) ", %2             \n\t"

  775.         "dec                         %1                 \n\t"

  776.         "dec                         %2                 \n\t"

  777.         "sub                         %0, %1             \n\t"

  778.         "sub                         %0, %2             \n\t"

  779.         "lea       " LOCAL_MANGLE(9b) ", %3             \n\t"

  780.         "sub                         %0, %3             \n\t"

  781. 

  782. 

  783.         : "=r" (fragmentB), "=r" (imm8OfPShufW1B), "=r" (imm8OfPShufW2B),

  784.           "=r" (fragmentLengthB)

  785.         );

  786. 

  787.     xpos        = 0; // lumXInc/2 - 0x8000; // difference between pixel centers

  788.     fragmentPos = 0;

  789. 

  790.     for (i = 0; i < dstW / numSplits; i++) {

  791.         int xx = xpos >> 16;

  792. 

  793.         if ((i & 3) == 0) {

  794.             int a                  = 0;

  795.             int b                  = ((xpos + xInc) >> 16) - xx;

  796.             int c                  = ((xpos + xInc * 2) >> 16) - xx;

  797.             int d                  = ((xpos + xInc * 3) >> 16) - xx;

  798.             int inc                = (d + 1 < 4);

  799.             uint8_t *fragment      = inc ? fragmentB : fragmentA;

  800.             x86_reg imm8OfPShufW1  = inc ? imm8OfPShufW1B : imm8OfPShufW1A;

  801.             x86_reg imm8OfPShufW2  = inc ? imm8OfPShufW2B : imm8OfPShufW2A;

  802.             x86_reg fragmentLength = inc ? fragmentLengthB : fragmentLengthA;

  803.             int maxShift           = 3 - (d + inc);

  804.             int shift              = 0;

  805. 

  806.             if (filterCode) {

  807.                 filter[i]        = ((xpos              & 0xFFFF) ^ 0xFFFF) >> 9;

  808.                 filter[i + 1]    = (((xpos + xInc)     & 0xFFFF) ^ 0xFFFF) >> 9;

  809.                 filter[i + 2]    = (((xpos + xInc * 2) & 0xFFFF) ^ 0xFFFF) >> 9;

  810.                 filter[i + 3]    = (((xpos + xInc * 3) & 0xFFFF) ^ 0xFFFF) >> 9;

  811.                 filterPos[i / 2] = xx;

  812. 

  813.                 memcpy(filterCode + fragmentPos, fragment, fragmentLength);

  814. 

  815.                 filterCode[fragmentPos + imm8OfPShufW1] =  (a + inc)       |

  816.                                                           ((b + inc) << 2) |

  817.                                                           ((c + inc) << 4) |

  818.                                                           ((d + inc) << 6);

  819.                 filterCode[fragmentPos + imm8OfPShufW2] =  a | (b << 2) |

  820.                                                                (c << 4) |

  821.                                                                (d << 6);

  822. 

  823.                 if (i + 4 - inc >= dstW)

  824.                     shift = maxShift;               // avoid overread

  825.                 else if ((filterPos[i / 2] & 3) <= maxShift)

  826.                     shift = filterPos[i / 2] & 3;   // align

  827. 

  828.                 if (shift && i >= shift) {

  829.                     filterCode[fragmentPos + imm8OfPShufW1] += 0x55 * shift;

  830.                     filterCode[fragmentPos + imm8OfPShufW2] += 0x55 * shift;

  831.                     filterPos[i / 2]                        -= shift;

  832.                 }

  833.             }

  834. 

  835.             fragmentPos += fragmentLength;

  836. 

  837.             if (filterCode)

  838.                 filterCode[fragmentPos] = RET;

  839.         }

  840.         xpos += xInc;

  841.     }

  842.     if (filterCode)

  843.         filterPos[((i / 2) + 1) & (~1)] = xpos >> 16;  // needed to jump to the next part

  844. 

  845.     return fragmentPos + 1;

  846. }

  847. #endif /* HAVE_MMXEXT_INLINE */

  848. 

  849. static void fill_rgb2yuv_table(SwsContext *c, const int table[4], int dstRange)

  850. {

  851.     int64_t W, V, Z, Cy, Cu, Cv;

  852.     int64_t vr =  table[0];

  853.     int64_t ub =  table[1];

  854.     int64_t ug = -table[2];

  855.     int64_t vg = -table[3];

  856.     int64_t ONE = 65536;

  857.     int64_t cy = ONE;

  858.     uint8_t *p = (uint8_t*)c->input_rgb2yuv_table;

  859.     int i;

  860.     static const int8_t map[] = {

  861.     BY_IDX, GY_IDX, -1    , BY_IDX, BY_IDX, GY_IDX, -1    , BY_IDX,

  862.     RY_IDX, -1    , GY_IDX, RY_IDX, RY_IDX, -1    , GY_IDX, RY_IDX,

  863.     RY_IDX, GY_IDX, -1    , RY_IDX, RY_IDX, GY_IDX, -1    , RY_IDX,

  864.     BY_IDX, -1    , GY_IDX, BY_IDX, BY_IDX, -1    , GY_IDX, BY_IDX,

  865.     BU_IDX, GU_IDX, -1    , BU_IDX, BU_IDX, GU_IDX, -1    , BU_IDX,

  866.     RU_IDX, -1    , GU_IDX, RU_IDX, RU_IDX, -1    , GU_IDX, RU_IDX,

  867.     RU_IDX, GU_IDX, -1    , RU_IDX, RU_IDX, GU_IDX, -1    , RU_IDX,

  868.     BU_IDX, -1    , GU_IDX, BU_IDX, BU_IDX, -1    , GU_IDX, BU_IDX,

  869.     BV_IDX, GV_IDX, -1    , BV_IDX, BV_IDX, GV_IDX, -1    , BV_IDX,

  870.     RV_IDX, -1    , GV_IDX, RV_IDX, RV_IDX, -1    , GV_IDX, RV_IDX,

  871.     RV_IDX, GV_IDX, -1    , RV_IDX, RV_IDX, GV_IDX, -1    , RV_IDX,

  872.     BV_IDX, -1    , GV_IDX, BV_IDX, BV_IDX, -1    , GV_IDX, BV_IDX,

  873.     RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX,

  874.     BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX,

  875.     GY_IDX, -1    , GY_IDX, -1    , GY_IDX, -1    , GY_IDX, -1    ,

  876.     -1    , GY_IDX, -1    , GY_IDX, -1    , GY_IDX, -1    , GY_IDX,

  877.     RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX,

  878.     BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX,

  879.     GU_IDX, -1    , GU_IDX, -1    , GU_IDX, -1    , GU_IDX, -1    ,

  880.     -1    , GU_IDX, -1    , GU_IDX, -1    , GU_IDX, -1    , GU_IDX,

  881.     RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX,

  882.     BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX,

  883.     GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    ,

  884.     -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, //23

  885.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //24

  886.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //25

  887.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //26

  888.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //27

  889.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //28

  890.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //29

  891.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //30

  892.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //31

  893.     BY_IDX, GY_IDX, RY_IDX, -1    , -1    , -1    , -1    , -1    , //32

  894.     BU_IDX, GU_IDX, RU_IDX, -1    , -1    , -1    , -1    , -1    , //33

  895.     BV_IDX, GV_IDX, RV_IDX, -1    , -1    , -1    , -1    , -1    , //34

  896.     };

  897. 

  898.     dstRange = 0; //FIXME range = 1 is handled elsewhere

  899. 

  900.     if (!dstRange) {

  901.         cy = cy * 255 / 219;

  902.     } else {

  903.         vr = vr * 224 / 255;

  904.         ub = ub * 224 / 255;

  905.         ug = ug * 224 / 255;

  906.         vg = vg * 224 / 255;

  907.     }

  908.     W = ROUNDED_DIV(ONE*ONE*ug, ub);

  909.     V = ROUNDED_DIV(ONE*ONE*vg, vr);

  910.     Z = ONE*ONE-W-V;

  911. 

  912.     Cy = ROUNDED_DIV(cy*Z, ONE);

  913.     Cu = ROUNDED_DIV(ub*Z, ONE);

  914.     Cv = ROUNDED_DIV(vr*Z, ONE);

  915. 

  916.     c->input_rgb2yuv_table[RY_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*V        , Cy);

  917.     c->input_rgb2yuv_table[GY_IDX] =  ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE  , Cy);

  918.     c->input_rgb2yuv_table[BY_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*W        , Cy);

  919. 

  920.     c->input_rgb2yuv_table[RU_IDX] =  ROUNDED_DIV((1 << RGB2YUV_SHIFT)*V        , Cu);

  921.     c->input_rgb2yuv_table[GU_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE  , Cu);

  922.     c->input_rgb2yuv_table[BU_IDX] =  ROUNDED_DIV((1 << RGB2YUV_SHIFT)*(Z+W)    , Cu);

  923. 

  924.     c->input_rgb2yuv_table[RV_IDX] =  ROUNDED_DIV((1 << RGB2YUV_SHIFT)*(V+Z)    , Cv);

  925.     c->input_rgb2yuv_table[GV_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE  , Cv);

  926.     c->input_rgb2yuv_table[BV_IDX] =  ROUNDED_DIV((1 << RGB2YUV_SHIFT)*W        , Cv);

  927. 

  928.     if(/*!dstRange && */!memcmp(table, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], sizeof(ff_yuv2rgb_coeffs[SWS_CS_DEFAULT]))) {

  929.         c->input_rgb2yuv_table[BY_IDX] =  ((int)(0.114 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));

  930.         c->input_rgb2yuv_table[BV_IDX] = (-(int)(0.081 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));

  931.         c->input_rgb2yuv_table[BU_IDX] =  ((int)(0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));

  932.         c->input_rgb2yuv_table[GY_IDX] =  ((int)(0.587 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));

  933.         c->input_rgb2yuv_table[GV_IDX] = (-(int)(0.419 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));

  934.         c->input_rgb2yuv_table[GU_IDX] = (-(int)(0.331 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));

  935.         c->input_rgb2yuv_table[RY_IDX] =  ((int)(0.299 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));

  936.         c->input_rgb2yuv_table[RV_IDX] =  ((int)(0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));

  937.         c->input_rgb2yuv_table[RU_IDX] = (-(int)(0.169 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));

  938.     }

  939.     for(i=0; i<FF_ARRAY_ELEMS(map); i++)

  940.         AV_WL16(p + 16*4 + 2*i, map[i] >= 0 ? c->input_rgb2yuv_table[map[i]] : 0);

  941. }

  942. 

  943. static void fill_xyztables(struct SwsContext *c)

  944. {

  945.     int i;

  946.     double xyzgamma = XYZ_GAMMA;

  947.     double rgbgamma = 1.0 / RGB_GAMMA;

  948.     double xyzgammainv = 1.0 / XYZ_GAMMA;

  949.     double rgbgammainv = RGB_GAMMA;

  950.     static const int16_t xyz2rgb_matrix[3][4] = {

  951.         {13270, -6295, -2041},

  952.         {-3969,  7682,   170},

  953.         {  228,  -835,  4329} };

  954.     static const int16_t rgb2xyz_matrix[3][4] = {

  955.         {1689, 1464,  739},

  956.         { 871, 2929,  296},

  957.         {  79,  488, 3891} };

  958.     static int16_t xyzgamma_tab[4096], rgbgamma_tab[4096], xyzgammainv_tab[4096], rgbgammainv_tab[4096];

  959. 

  960.     memcpy(c->xyz2rgb_matrix, xyz2rgb_matrix, sizeof(c->xyz2rgb_matrix));

  961.     memcpy(c->rgb2xyz_matrix, rgb2xyz_matrix, sizeof(c->rgb2xyz_matrix));

  962.     c->xyzgamma = xyzgamma_tab;

  963.     c->rgbgamma = rgbgamma_tab;

  964.     c->xyzgammainv = xyzgammainv_tab;

  965.     c->rgbgammainv = rgbgammainv_tab;

  966. 

  967.     if (rgbgamma_tab[4095])

  968.         return;

  969. 

  970.     /* set gamma vectors */

  971.     for (i = 0; i < 4096; i++) {

  972.         xyzgamma_tab[i] = lrint(pow(i / 4095.0, xyzgamma) * 4095.0);

  973.         rgbgamma_tab[i] = lrint(pow(i / 4095.0, rgbgamma) * 4095.0);

  974.         xyzgammainv_tab[i] = lrint(pow(i / 4095.0, xyzgammainv) * 4095.0);

  975.         rgbgammainv_tab[i] = lrint(pow(i / 4095.0, rgbgammainv) * 4095.0);

  976.     }

  977. }

  978. 

  979. int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4],

  980.                              int srcRange, const int table[4], int dstRange,

  981.                              int brightness, int contrast, int saturation)

  982. {

  983.     const AVPixFmtDescriptor *desc_dst;

  984.     const AVPixFmtDescriptor *desc_src;

  985.     memmove(c->srcColorspaceTable, inv_table, sizeof(int) * 4);

  986.     memmove(c->dstColorspaceTable, table, sizeof(int) * 4);

  987. 

  988.     handle_formats(c);

  989.     desc_dst = av_pix_fmt_desc_get(c->dstFormat);

  990.     desc_src = av_pix_fmt_desc_get(c->srcFormat);

  991. 

  992.     if(!isYUV(c->dstFormat) && !isGray(c->dstFormat))

  993.         dstRange = 0;

  994.     if(!isYUV(c->srcFormat) && !isGray(c->srcFormat))

  995.         srcRange = 0;

  996. 

  997.     c->brightness = brightness;

  998.     c->contrast   = contrast;

  999.     c->saturation = saturation;

  1000.     c->srcRange   = srcRange;

  1001.     c->dstRange   = dstRange;

  1002. 

  1003.     if ((isYUV(c->dstFormat) || isGray(c->dstFormat)) && (isYUV(c->srcFormat) || isGray(c->srcFormat)))

  1004.         return -1;

  1005. 

  1006.     c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);

  1007.     c->srcFormatBpp = av_get_bits_per_pixel(desc_src);

  1008. 

  1009.     if (!isYUV(c->dstFormat) && !isGray(c->dstFormat)) {

  1010.         ff_yuv2rgb_c_init_tables(c, inv_table, srcRange, brightness,

  1011.                                  contrast, saturation);

  1012.         // FIXME factorize

  1013. 

  1014.         if (ARCH_PPC)

  1015.             ff_yuv2rgb_init_tables_ppc(c, inv_table, brightness,

  1016.                                        contrast, saturation);

  1017.     }

  1018. 

  1019.     fill_rgb2yuv_table(c, table, dstRange);

  1020. 

  1021.     return 0;

  1022. }

  1023. 

  1024. int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table,

  1025.                              int *srcRange, int **table, int *dstRange,

  1026.                              int *brightness, int *contrast, int *saturation)

  1027. {

  1028.     if (!c )

  1029.         return -1;

  1030. 

  1031.     *inv_table  = c->srcColorspaceTable;

  1032.     *table      = c->dstColorspaceTable;

  1033.     *srcRange   = c->srcRange;

  1034.     *dstRange   = c->dstRange;

  1035.     *brightness = c->brightness;

  1036.     *contrast   = c->contrast;

  1037.     *saturation = c->saturation;

  1038. 

  1039.     return 0;

  1040. }

  1041. 

  1042. static int handle_jpeg(enum AVPixelFormat *format)

  1043. {

  1044.     switch (*format) {

  1045.     case AV_PIX_FMT_YUVJ420P:

  1046.         *format = AV_PIX_FMT_YUV420P;

  1047.         return 1;

  1048.     case AV_PIX_FMT_YUVJ411P:

  1049.         *format = AV_PIX_FMT_YUV411P;

  1050.         return 1;

  1051.     case AV_PIX_FMT_YUVJ422P:

  1052.         *format = AV_PIX_FMT_YUV422P;

  1053.         return 1;

  1054.     case AV_PIX_FMT_YUVJ444P:

  1055.         *format = AV_PIX_FMT_YUV444P;

  1056.         return 1;

  1057.     case AV_PIX_FMT_YUVJ440P:

  1058.         *format = AV_PIX_FMT_YUV440P;

  1059.         return 1;

  1060.     case AV_PIX_FMT_GRAY8:

  1061.     case AV_PIX_FMT_GRAY16LE:

  1062.     case AV_PIX_FMT_GRAY16BE:

  1063.         return 1;

  1064.     default:

  1065.         return 0;

  1066.     }

  1067. }

  1068. 

  1069. static int handle_0alpha(enum AVPixelFormat *format)

  1070. {

  1071.     switch (*format) {

  1072.     case AV_PIX_FMT_0BGR    : *format = AV_PIX_FMT_ABGR   ; return 1;

  1073.     case AV_PIX_FMT_BGR0    : *format = AV_PIX_FMT_BGRA   ; return 4;

  1074.     case AV_PIX_FMT_0RGB    : *format = AV_PIX_FMT_ARGB   ; return 1;

  1075.     case AV_PIX_FMT_RGB0    : *format = AV_PIX_FMT_RGBA   ; return 4;

  1076.     default:                                          return 0;

  1077.     }

  1078. }

  1079. 

  1080. static int handle_xyz(enum AVPixelFormat *format)

  1081. {

  1082.     switch (*format) {

  1083.     case AV_PIX_FMT_XYZ12BE : *format = AV_PIX_FMT_RGB48BE; return 1;

  1084.     case AV_PIX_FMT_XYZ12LE : *format = AV_PIX_FMT_RGB48LE; return 1;

  1085.     default:                                                return 0;

  1086.     }

  1087. }

  1088. 

  1089. static void handle_formats(SwsContext *c)

  1090. {

  1091.     c->src0Alpha |= handle_0alpha(&c->srcFormat);

  1092.     c->dst0Alpha |= handle_0alpha(&c->dstFormat);

  1093.     c->srcXYZ    |= handle_xyz(&c->srcFormat);

  1094.     c->dstXYZ    |= handle_xyz(&c->dstFormat);

  1095.     if (c->srcXYZ || c->dstXYZ)

  1096.         fill_xyztables(c);

  1097. }

  1098. 

  1099. SwsContext *sws_alloc_context(void)

  1100. {

  1101.     SwsContext *c = av_mallocz(sizeof(SwsContext));

  1102. 

  1103.     if (c) {

  1104.         c->av_class = &sws_context_class;

  1105.         av_opt_set_defaults(c);

  1106.     }

  1107. 

  1108.     return c;

  1109. }

  1110. 

  1111. av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,

  1112.                              SwsFilter *dstFilter)

  1113. {

  1114.     int i, j;

  1115.     int usesVFilter, usesHFilter;

  1116.     int unscaled;

  1117.     SwsFilter dummyFilter = { NULL, NULL, NULL, NULL };

  1118.     int srcW              = c->srcW;

  1119.     int srcH              = c->srcH;

  1120.     int dstW              = c->dstW;

  1121.     int dstH              = c->dstH;

  1122.     int dst_stride        = FFALIGN(dstW * sizeof(int16_t) + 66, 16);

  1123.     int flags, cpu_flags;

  1124.     enum AVPixelFormat srcFormat = c->srcFormat;

  1125.     enum AVPixelFormat dstFormat = c->dstFormat;

  1126.     const AVPixFmtDescriptor *desc_src;

  1127.     const AVPixFmtDescriptor *desc_dst;

  1128. 

  1129.     cpu_flags = av_get_cpu_flags();

  1130.     flags     = c->flags;

  1131.     emms_c();

  1132.     if (!rgb15to16)

  1133.         sws_rgb2rgb_init();

  1134. 

  1135.     unscaled = (srcW == dstW && srcH == dstH);

  1136. 

  1137.     c->srcRange |= handle_jpeg(&c->srcFormat);

  1138.     c->dstRange |= handle_jpeg(&c->dstFormat);

  1139. 

  1140.     if(srcFormat!=c->srcFormat || dstFormat!=c->dstFormat)

  1141.         av_log(c, AV_LOG_WARNING, "deprecated pixel format used, make sure you did set range correctly\n");

  1142. 

  1143.     if (!c->contrast && !c->saturation && !c->dstFormatBpp)

  1144.         sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,

  1145.                                  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],

  1146.                                  c->dstRange, 0, 1 << 16, 1 << 16);

  1147. 

  1148.     handle_formats(c);

  1149.     srcFormat = c->srcFormat;

  1150.     dstFormat = c->dstFormat;

  1151.     desc_src = av_pix_fmt_desc_get(srcFormat);

  1152.     desc_dst = av_pix_fmt_desc_get(dstFormat);

  1153. 

  1154.     if (!(unscaled && sws_isSupportedEndiannessConversion(srcFormat) &&

  1155.           av_pix_fmt_swap_endianness(srcFormat) == dstFormat)) {

  1156.     if (!sws_isSupportedInput(srcFormat)) {

  1157.         av_log(c, AV_LOG_ERROR, "%s is not supported as input pixel format\n",

  1158.                av_get_pix_fmt_name(srcFormat));

  1159.         return AVERROR(EINVAL);

  1160.     }

  1161.     if (!sws_isSupportedOutput(dstFormat)) {

  1162.         av_log(c, AV_LOG_ERROR, "%s is not supported as output pixel format\n",

  1163.                av_get_pix_fmt_name(dstFormat));

  1164.         return AVERROR(EINVAL);

  1165.     }

  1166.     }

  1167. 

  1168.     i = flags & (SWS_POINT         |

  1169.                  SWS_AREA          |

  1170.                  SWS_BILINEAR      |

  1171.                  SWS_FAST_BILINEAR |

  1172.                  SWS_BICUBIC       |

  1173.                  SWS_X             |

  1174.                  SWS_GAUSS         |

  1175.                  SWS_LANCZOS       |

  1176.                  SWS_SINC          |

  1177.                  SWS_SPLINE        |

  1178.                  SWS_BICUBLIN);

  1179. 

  1180.     /* provide a default scaler if not set by caller */

  1181.     if (!i) {

  1182.         if (dstW < srcW && dstH < srcH)

  1183.             flags |= SWS_BICUBIC;

  1184.         else if (dstW > srcW && dstH > srcH)

  1185.             flags |= SWS_BICUBIC;

  1186.         else

  1187.             flags |= SWS_BICUBIC;

  1188.         c->flags = flags;

  1189.     } else if (i & (i - 1)) {

  1190.         av_log(c, AV_LOG_ERROR,

  1191.                "Exactly one scaler algorithm must be chosen, got %X\n", i);

  1192.         return AVERROR(EINVAL);

  1193.     }

  1194.     /* sanity check */

  1195.     if (srcW < 1 || srcH < 1 || dstW < 1 || dstH < 1) {

  1196.         /* FIXME check if these are enough and try to lower them after

  1197.          * fixing the relevant parts of the code */

  1198.         av_log(c, AV_LOG_ERROR, "%dx%d -> %dx%d is invalid scaling dimension\n",

  1199.                srcW, srcH, dstW, dstH);

  1200.         return AVERROR(EINVAL);

  1201.     }

  1202. 

  1203.     if (!dstFilter)

  1204.         dstFilter = &dummyFilter;

  1205.     if (!srcFilter)

  1206.         srcFilter = &dummyFilter;

  1207. 

  1208.     c->lumXInc      = (((int64_t)srcW << 16) + (dstW >> 1)) / dstW;

  1209.     c->lumYInc      = (((int64_t)srcH << 16) + (dstH >> 1)) / dstH;

  1210.     c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);

  1211.     c->srcFormatBpp = av_get_bits_per_pixel(desc_src);

  1212.     c->vRounder     = 4 * 0x0001000100010001ULL;

  1213. 

  1214.     usesVFilter = (srcFilter->lumV && srcFilter->lumV->length > 1) ||

  1215.                   (srcFilter->chrV && srcFilter->chrV->length > 1) ||

  1216.                   (dstFilter->lumV && dstFilter->lumV->length > 1) ||

  1217.                   (dstFilter->chrV && dstFilter->chrV->length > 1);

  1218.     usesHFilter = (srcFilter->lumH && srcFilter->lumH->length > 1) ||

  1219.                   (srcFilter->chrH && srcFilter->chrH->length > 1) ||

  1220.                   (dstFilter->lumH && dstFilter->lumH->length > 1) ||

  1221.                   (dstFilter->chrH && dstFilter->chrH->length > 1);

  1222. 

  1223.     av_pix_fmt_get_chroma_sub_sample(srcFormat, &c->chrSrcHSubSample, &c->chrSrcVSubSample);

  1224.     av_pix_fmt_get_chroma_sub_sample(dstFormat, &c->chrDstHSubSample, &c->chrDstVSubSample);

  1225. 

  1226.     if (isAnyRGB(dstFormat) && !(flags&SWS_FULL_CHR_H_INT)) {

  1227.         if (dstW&1) {

  1228.             av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to odd output size\n");

  1229.             flags |= SWS_FULL_CHR_H_INT;

  1230.             c->flags = flags;

  1231.         }

  1232. 

  1233.         if (   c->chrSrcHSubSample == 0

  1234.             && c->chrSrcVSubSample == 0

  1235.             && c->dither != SWS_DITHER_BAYER //SWS_FULL_CHR_H_INT is currently not supported with SWS_DITHER_BAYER

  1236.             && !(c->flags & SWS_FAST_BILINEAR)

  1237.         ) {

  1238.             av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to input having non subsampled chroma\n");

  1239.             flags |= SWS_FULL_CHR_H_INT;

  1240.             c->flags = flags;

  1241.         }

  1242.     }

  1243. 

  1244.     if (c->dither == SWS_DITHER_AUTO) {

  1245.         if (flags & SWS_ERROR_DIFFUSION)

  1246.             c->dither = SWS_DITHER_ED;

  1247.     }

  1248. 

  1249.     if(dstFormat == AV_PIX_FMT_BGR4_BYTE ||

  1250.        dstFormat == AV_PIX_FMT_RGB4_BYTE ||

  1251.        dstFormat == AV_PIX_FMT_BGR8 ||

  1252.        dstFormat == AV_PIX_FMT_RGB8) {

  1253.         if (c->dither == SWS_DITHER_AUTO)

  1254.             c->dither = (flags & SWS_FULL_CHR_H_INT) ? SWS_DITHER_ED : SWS_DITHER_BAYER;

  1255.         if (!(flags & SWS_FULL_CHR_H_INT)) {

  1256.             if (c->dither == SWS_DITHER_ED || c->dither == SWS_DITHER_A_DITHER || c->dither == SWS_DITHER_X_DITHER) {

  1257.                 av_log(c, AV_LOG_DEBUG,

  1258.                     "Desired dithering only supported in full chroma interpolation for destination format '%s'\n",

  1259.                     av_get_pix_fmt_name(dstFormat));

  1260.                 flags   |= SWS_FULL_CHR_H_INT;

  1261.                 c->flags = flags;

  1262.             }

  1263.         }

  1264.         if (flags & SWS_FULL_CHR_H_INT) {

  1265.             if (c->dither == SWS_DITHER_BAYER) {

  1266.                 av_log(c, AV_LOG_DEBUG,

  1267.                     "Ordered dither is not supported in full chroma interpolation for destination format '%s'\n",

  1268.                     av_get_pix_fmt_name(dstFormat));

  1269.                 c->dither = SWS_DITHER_ED;

  1270.             }

  1271.         }

  1272.     }

  1273.     if (isPlanarRGB(dstFormat)) {

  1274.         if (!(flags & SWS_FULL_CHR_H_INT)) {

  1275.             av_log(c, AV_LOG_DEBUG,

  1276.                    "%s output is not supported with half chroma resolution, switching to full\n",

  1277.                    av_get_pix_fmt_name(dstFormat));

  1278.             flags   |= SWS_FULL_CHR_H_INT;

  1279.             c->flags = flags;

  1280.         }

  1281.     }

  1282. 

  1283.     /* reuse chroma for 2 pixels RGB/BGR unless user wants full

  1284.      * chroma interpolation */

  1285.     if (flags & SWS_FULL_CHR_H_INT &&

  1286.         isAnyRGB(dstFormat)        &&

  1287.         !isPlanarRGB(dstFormat)    &&

  1288.         dstFormat != AV_PIX_FMT_RGBA  &&

  1289.         dstFormat != AV_PIX_FMT_ARGB  &&

  1290.         dstFormat != AV_PIX_FMT_BGRA  &&

  1291.         dstFormat != AV_PIX_FMT_ABGR  &&

  1292.         dstFormat != AV_PIX_FMT_RGB24 &&

  1293.         dstFormat != AV_PIX_FMT_BGR24 &&

  1294.         dstFormat != AV_PIX_FMT_BGR4_BYTE &&

  1295.         dstFormat != AV_PIX_FMT_RGB4_BYTE &&

  1296.         dstFormat != AV_PIX_FMT_BGR8 &&

  1297.         dstFormat != AV_PIX_FMT_RGB8

  1298.     ) {

  1299.         av_log(c, AV_LOG_WARNING,

  1300.                "full chroma interpolation for destination format '%s' not yet implemented\n",

  1301.                av_get_pix_fmt_name(dstFormat));

  1302.         flags   &= ~SWS_FULL_CHR_H_INT;

  1303.         c->flags = flags;

  1304.     }

  1305.     if (isAnyRGB(dstFormat) && !(flags & SWS_FULL_CHR_H_INT))

  1306.         c->chrDstHSubSample = 1;

  1307. 

  1308.     // drop some chroma lines if the user wants it

  1309.     c->vChrDrop          = (flags & SWS_SRC_V_CHR_DROP_MASK) >>

  1310.                            SWS_SRC_V_CHR_DROP_SHIFT;

  1311.     c->chrSrcVSubSample += c->vChrDrop;

  1312. 

  1313.     /* drop every other pixel for chroma calculation unless user

  1314.      * wants full chroma */

  1315.     if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP)   &&

  1316.         srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&

  1317.         srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&

  1318.         srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&

  1319.         srcFormat != AV_PIX_FMT_GBRP9BE   && srcFormat != AV_PIX_FMT_GBRP9LE  &&

  1320.         srcFormat != AV_PIX_FMT_GBRP10BE  && srcFormat != AV_PIX_FMT_GBRP10LE &&

  1321.         srcFormat != AV_PIX_FMT_GBRP12BE  && srcFormat != AV_PIX_FMT_GBRP12LE &&

  1322.         srcFormat != AV_PIX_FMT_GBRP14BE  && srcFormat != AV_PIX_FMT_GBRP14LE &&

  1323.         srcFormat != AV_PIX_FMT_GBRP16BE  && srcFormat != AV_PIX_FMT_GBRP16LE &&

  1324.         ((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||

  1325.          (flags & SWS_FAST_BILINEAR)))

  1326.         c->chrSrcHSubSample = 1;

  1327. 

  1328.     // Note the FF_CEIL_RSHIFT is so that we always round toward +inf.

  1329.     c->chrSrcW = FF_CEIL_RSHIFT(srcW, c->chrSrcHSubSample);

  1330.     c->chrSrcH = FF_CEIL_RSHIFT(srcH, c->chrSrcVSubSample);

  1331.     c->chrDstW = FF_CEIL_RSHIFT(dstW, c->chrDstHSubSample);

  1332.     c->chrDstH = FF_CEIL_RSHIFT(dstH, c->chrDstVSubSample);

  1333. 

  1334.     FF_ALLOC_OR_GOTO(c, c->formatConvBuffer, FFALIGN(srcW*2+78, 16) * 2, fail);

  1335. 

  1336.     /* unscaled special cases */

  1337.     if (unscaled && !usesHFilter && !usesVFilter &&

  1338.         (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) {

  1339.         ff_get_unscaled_swscale(c);

  1340. 

  1341.         if (c->swscale) {

  1342.             if (flags & SWS_PRINT_INFO)

  1343.                 av_log(c, AV_LOG_INFO,

  1344.                        "using unscaled %s -> %s special converter\n",

  1345.                        av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));

  1346.             return 0;

  1347.         }

  1348.     }

  1349. 

  1350.     c->srcBpc = 1 + desc_src->comp[0].depth_minus1;

  1351.     if (c->srcBpc < 8)

  1352.         c->srcBpc = 8;

  1353.     c->dstBpc = 1 + desc_dst->comp[0].depth_minus1;

  1354.     if (c->dstBpc < 8)

  1355.         c->dstBpc = 8;

  1356.     if (isAnyRGB(srcFormat) || srcFormat == AV_PIX_FMT_PAL8)

  1357.         c->srcBpc = 16;

  1358.     if (c->dstBpc == 16)

  1359.         dst_stride <<= 1;

  1360. 

  1361.     if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 14) {

  1362.         c->canMMXEXTBeUsed = dstW >= srcW && (dstW & 31) == 0 &&

  1363.                              c->chrDstW >= c->chrSrcW &&

  1364.                              (srcW & 15) == 0;

  1365.         if (!c->canMMXEXTBeUsed && dstW >= srcW && c->chrDstW >= c->chrSrcW && (srcW & 15) == 0

  1366. 

  1367.             && (flags & SWS_FAST_BILINEAR)) {

  1368.             if (flags & SWS_PRINT_INFO)

  1369.                 av_log(c, AV_LOG_INFO,

  1370.                        "output width is not a multiple of 32 -> no MMXEXT scaler\n");

  1371.         }

  1372.         if (usesHFilter || isNBPS(c->srcFormat) || is16BPS(c->srcFormat) || isAnyRGB(c->srcFormat))

  1373.             c->canMMXEXTBeUsed = 0;

  1374.     } else

  1375.         c->canMMXEXTBeUsed = 0;

  1376. 

  1377.     c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;

  1378.     c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;

  1379. 

  1380.     /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src

  1381.      * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do

  1382.      * correct scaling.

  1383.      * n-2 is the last chrominance sample available.

  1384.      * This is not perfect, but no one should notice the difference, the more

  1385.      * correct variant would be like the vertical one, but that would require

  1386.      * some special code for the first and last pixel */

  1387.     if (flags & SWS_FAST_BILINEAR) {

  1388.         if (c->canMMXEXTBeUsed) {

  1389.             c->lumXInc += 20;

  1390.             c->chrXInc += 20;

  1391.         }

  1392.         // we don't use the x86 asm scaler if MMX is available

  1393.         else if (INLINE_MMX(cpu_flags) && c->dstBpc <= 14) {

  1394.             c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;

  1395.             c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;

  1396.         }

  1397.     }

  1398. 

  1399. #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)

  1400. 

  1401.     /* precalculate horizontal scaler filter coefficients */

  1402.     {

  1403. #if HAVE_MMXEXT_INLINE

  1404. // can't downscale !!!

  1405.         if (c->canMMXEXTBeUsed && (flags & SWS_FAST_BILINEAR)) {

  1406.             c->lumMmxextFilterCodeSize = init_hscaler_mmxext(dstW, c->lumXInc, NULL,

  1407.                                                              NULL, NULL, 8);

  1408.             c->chrMmxextFilterCodeSize = init_hscaler_mmxext(c->chrDstW, c->chrXInc,

  1409.                                                              NULL, NULL, NULL, 4);

  1410. 

  1411. #if USE_MMAP

  1412.             c->lumMmxextFilterCode = mmap(NULL, c->lumMmxextFilterCodeSize,

  1413.                                           PROT_READ | PROT_WRITE,

  1414.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1415.                                           -1, 0);

  1416.             c->chrMmxextFilterCode = mmap(NULL, c->chrMmxextFilterCodeSize,

  1417.                                           PROT_READ | PROT_WRITE,

  1418.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1419.                                           -1, 0);

  1420. #elif HAVE_VIRTUALALLOC

  1421.             c->lumMmxextFilterCode = VirtualAlloc(NULL,

  1422.                                                   c->lumMmxextFilterCodeSize,

  1423.                                                   MEM_COMMIT,

  1424.                                                   PAGE_EXECUTE_READWRITE);

  1425.             c->chrMmxextFilterCode = VirtualAlloc(NULL,

  1426.                                                   c->chrMmxextFilterCodeSize,

  1427.                                                   MEM_COMMIT,

  1428.                                                   PAGE_EXECUTE_READWRITE);

  1429. #else

  1430.             c->lumMmxextFilterCode = av_malloc(c->lumMmxextFilterCodeSize);

  1431.             c->chrMmxextFilterCode = av_malloc(c->chrMmxextFilterCodeSize);

  1432. #endif

  1433. 

  1434. #ifdef MAP_ANONYMOUS

  1435.             if (c->lumMmxextFilterCode == MAP_FAILED || c->chrMmxextFilterCode == MAP_FAILED)

  1436. #else

  1437.             if (!c->lumMmxextFilterCode || !c->chrMmxextFilterCode)

  1438. #endif

  1439.             {

  1440.                 av_log(c, AV_LOG_ERROR, "Failed to allocate MMX2FilterCode\n");

  1441.                 return AVERROR(ENOMEM);

  1442.             }

  1443. 

  1444.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter,    (dstW           / 8 + 8) * sizeof(int16_t), fail);

  1445.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter,    (c->chrDstW     / 4 + 8) * sizeof(int16_t), fail);

  1446.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW       / 2 / 8 + 8) * sizeof(int32_t), fail);

  1447.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);

  1448. 

  1449.             init_hscaler_mmxext(      dstW, c->lumXInc, c->lumMmxextFilterCode,

  1450.                                 c->hLumFilter, (uint32_t*)c->hLumFilterPos, 8);

  1451.             init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,

  1452.                                 c->hChrFilter, (uint32_t*)c->hChrFilterPos, 4);

  1453. 

  1454. #if USE_MMAP

  1455.             if (   mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1

  1456.                 || mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1) {

  1457.                 av_log(c, AV_LOG_ERROR, "mprotect failed, cannot use fast bilinear scaler\n");

  1458.                 goto fail;

  1459.             }

  1460. #endif

  1461.         } else

  1462. #endif /* HAVE_MMXEXT_INLINE */

  1463.         {

  1464.             const int filterAlign = X86_MMX(cpu_flags)     ? 4 :

  1465.                                     PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1466. 

  1467.             if (initFilter(&c->hLumFilter, &c->hLumFilterPos,

  1468.                            &c->hLumFilterSize, c->lumXInc,

  1469.                            srcW, dstW, filterAlign, 1 << 14,

  1470.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1471.                            cpu_flags, srcFilter->lumH, dstFilter->lumH,

  1472.                            c->param,

  1473.                            get_local_pos(c, 0, 0, 0),

  1474.                            get_local_pos(c, 0, 0, 0)) < 0)

  1475.                 goto fail;

  1476.             if (initFilter(&c->hChrFilter, &c->hChrFilterPos,

  1477.                            &c->hChrFilterSize, c->chrXInc,

  1478.                            c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,

  1479.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1480.                            cpu_flags, srcFilter->chrH, dstFilter->chrH,

  1481.                            c->param,

  1482.                            get_local_pos(c, c->chrSrcHSubSample, c->src_h_chr_pos, 0),

  1483.                            get_local_pos(c, c->chrDstHSubSample, c->dst_h_chr_pos, 0)) < 0)

  1484.                 goto fail;

  1485.         }

  1486.     } // initialize horizontal stuff

  1487. 

  1488.     /* precalculate vertical scaler filter coefficients */

  1489.     {

  1490.         const int filterAlign = X86_MMX(cpu_flags)     ? 2 :

  1491.                                 PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1492. 

  1493.         if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,

  1494.                        c->lumYInc, srcH, dstH, filterAlign, (1 << 12),

  1495.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1496.                        cpu_flags, srcFilter->lumV, dstFilter->lumV,

  1497.                        c->param,

  1498.                        get_local_pos(c, 0, 0, 1),

  1499.                        get_local_pos(c, 0, 0, 1)) < 0)

  1500.             goto fail;

  1501.         if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,

  1502.                        c->chrYInc, c->chrSrcH, c->chrDstH,

  1503.                        filterAlign, (1 << 12),

  1504.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1505.                        cpu_flags, srcFilter->chrV, dstFilter->chrV,

  1506.                        c->param,

  1507.                        get_local_pos(c, c->chrSrcVSubSample, c->src_v_chr_pos, 1),

  1508.                        get_local_pos(c, c->chrDstVSubSample, c->dst_v_chr_pos, 1)) < 0)

  1509. 

  1510.             goto fail;

  1511. 

  1512. #if HAVE_ALTIVEC

  1513.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH,    fail);

  1514.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);

  1515. 

  1516.         for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {

  1517.             int j;

  1518.             short *p = (short *)&c->vYCoeffsBank[i];

  1519.             for (j = 0; j < 8; j++)

  1520.                 p[j] = c->vLumFilter[i];

  1521.         }

  1522. 

  1523.         for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {

  1524.             int j;

  1525.             short *p = (short *)&c->vCCoeffsBank[i];

  1526.             for (j = 0; j < 8; j++)

  1527.                 p[j] = c->vChrFilter[i];

  1528.         }

  1529. #endif

  1530.     }

  1531. 

  1532.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1533.     c->vLumBufSize = c->vLumFilterSize;

  1534.     c->vChrBufSize = c->vChrFilterSize;

  1535.     for (i = 0; i < dstH; i++) {

  1536.         int chrI      = (int64_t)i * c->chrDstH / dstH;

  1537.         int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,

  1538.                               ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)

  1539.                                << c->chrSrcVSubSample));

  1540. 

  1541.         nextSlice >>= c->chrSrcVSubSample;

  1542.         nextSlice <<= c->chrSrcVSubSample;

  1543.         if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)

  1544.             c->vLumBufSize = nextSlice - c->vLumFilterPos[i];

  1545.         if (c->vChrFilterPos[chrI] + c->vChrBufSize <

  1546.             (nextSlice >> c->chrSrcVSubSample))

  1547.             c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -

  1548.                              c->vChrFilterPos[chrI];

  1549.     }

  1550. 

  1551.     for (i = 0; i < 4; i++)

  1552.         FF_ALLOCZ_OR_GOTO(c, c->dither_error[i], (c->dstW+2) * sizeof(int), fail);

  1553. 

  1554.     /* Allocate pixbufs (we use dynamic allocation because otherwise we would

  1555.      * need to allocate several megabytes to handle all possible cases) */

  1556.     FF_ALLOC_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1557.     FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1558.     FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1559.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1560.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1561.     /* Note we need at least one pixel more at the end because of the MMX code

  1562.      * (just in case someone wants to replace the 4000/8000). */

  1563.     /* align at 16 bytes for AltiVec */

  1564.     for (i = 0; i < c->vLumBufSize; i++) {

  1565.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],

  1566.                           dst_stride + 16, fail);

  1567.         c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];

  1568.     }

  1569.     // 64 / c->scalingBpp is the same as 16 / sizeof(scaling_intermediate)

  1570.     c->uv_off   = (dst_stride>>1) + 64 / (c->dstBpc &~ 7);

  1571.     c->uv_offx2 = dst_stride + 16;

  1572.     for (i = 0; i < c->vChrBufSize; i++) {

  1573.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],

  1574.                          dst_stride * 2 + 32, fail);

  1575.         c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];

  1576.         c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]

  1577.                          = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1578.     }

  1579.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1580.         for (i = 0; i < c->vLumBufSize; i++) {

  1581.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],

  1582.                               dst_stride + 16, fail);

  1583.             c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];

  1584.         }

  1585. 

  1586.     // try to avoid drawing green stuff between the right end and the stride end

  1587.     for (i = 0; i < c->vChrBufSize; i++)

  1588.         if(desc_dst->comp[0].depth_minus1 == 15){

  1589.             av_assert0(c->dstBpc > 14);

  1590.             for(j=0; j<dst_stride/2+1; j++)

  1591.                 ((int32_t*)(c->chrUPixBuf[i]))[j] = 1<<18;

  1592.         } else

  1593.             for(j=0; j<dst_stride+1; j++)

  1594.                 ((int16_t*)(c->chrUPixBuf[i]))[j] = 1<<14;

  1595. 

  1596.     av_assert0(c->chrDstH <= dstH);

  1597. 

  1598.     if (flags & SWS_PRINT_INFO) {

  1599.         const char *scaler = NULL, *cpucaps;

  1600. 

  1601.         for (i = 0; i < FF_ARRAY_ELEMS(scale_algorithms); i++) {

  1602.             if (flags & scale_algorithms[i].flag) {

  1603.                 scaler = scale_algorithms[i].description;

  1604.                 break;

  1605.             }

  1606.         }

  1607.         if (!scaler)

  1608.             scaler =  "ehh flags invalid?!";

  1609.         av_log(c, AV_LOG_INFO, "%s scaler, from %s to %s%s ",

  1610.                scaler,

  1611.                av_get_pix_fmt_name(srcFormat),

  1612. #ifdef DITHER1XBPP

  1613.                dstFormat == AV_PIX_FMT_BGR555   || dstFormat == AV_PIX_FMT_BGR565   ||

  1614.                dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||

  1615.                dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?

  1616.                                                              "dithered " : "",

  1617. #else

  1618.                "",

  1619. #endif

  1620.                av_get_pix_fmt_name(dstFormat));

  1621. 

  1622.         if (INLINE_MMXEXT(cpu_flags))

  1623.             cpucaps = "MMXEXT";

  1624.         else if (INLINE_AMD3DNOW(cpu_flags))

  1625.             cpucaps = "3DNOW";

  1626.         else if (INLINE_MMX(cpu_flags))

  1627.             cpucaps = "MMX";

  1628.         else if (PPC_ALTIVEC(cpu_flags))

  1629.             cpucaps = "AltiVec";

  1630.         else

  1631.             cpucaps = "C";

  1632. 

  1633.         av_log(c, AV_LOG_INFO, "using %s\n", cpucaps);

  1634. 

  1635.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1636.         av_log(c, AV_LOG_DEBUG,

  1637.                "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1638.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1639.         av_log(c, AV_LOG_DEBUG,

  1640.                "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1641.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,

  1642.                c->chrXInc, c->chrYInc);

  1643.     }

  1644. 

  1645.     c->swscale = ff_getSwsFunc(c);

  1646.     return 0;

  1647. fail: // FIXME replace things by appropriate error codes

  1648.     return -1;

  1649. }

  1650. 

  1651. #if FF_API_SWS_GETCONTEXT

  1652. SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1653.                            int dstW, int dstH, enum AVPixelFormat dstFormat,

  1654.                            int flags, SwsFilter *srcFilter,

  1655.                            SwsFilter *dstFilter, const double *param)

  1656. {

  1657.     SwsContext *c;

  1658. 

  1659.     if (!(c = sws_alloc_context()))

  1660.         return NULL;

  1661. 

  1662.     c->flags     = flags;

  1663.     c->srcW      = srcW;

  1664.     c->srcH      = srcH;

  1665.     c->dstW      = dstW;

  1666.     c->dstH      = dstH;

  1667.     c->srcFormat = srcFormat;

  1668.     c->dstFormat = dstFormat;

  1669. 

  1670.     if (param) {

  1671.         c->param[0] = param[0];

  1672.         c->param[1] = param[1];

  1673.     }

  1674. 

  1675.     if (sws_init_context(c, srcFilter, dstFilter) < 0) {

  1676.         sws_freeContext(c);

  1677.         return NULL;

  1678.     }

  1679. 

  1680.     return c;

  1681. }

  1682. #endif

  1683. 

  1684. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1685.                                 float lumaSharpen, float chromaSharpen,

  1686.                                 float chromaHShift, float chromaVShift,

  1687.                                 int verbose)

  1688. {

  1689.     SwsFilter *filter = av_malloc(sizeof(SwsFilter));

  1690.     if (!filter)

  1691.         return NULL;

  1692. 

  1693.     if (lumaGBlur != 0.0) {

  1694.         filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);

  1695.         filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);

  1696.     } else {

  1697.         filter->lumH = sws_getIdentityVec();

  1698.         filter->lumV = sws_getIdentityVec();

  1699.     }

  1700. 

  1701.     if (chromaGBlur != 0.0) {

  1702.         filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);

  1703.         filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);

  1704.     } else {

  1705.         filter->chrH = sws_getIdentityVec();

  1706.         filter->chrV = sws_getIdentityVec();

  1707.     }

  1708. 

  1709.     if (chromaSharpen != 0.0) {

  1710.         SwsVector *id = sws_getIdentityVec();

  1711.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1712.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1713.         sws_addVec(filter->chrH, id);

  1714.         sws_addVec(filter->chrV, id);

  1715.         sws_freeVec(id);

  1716.     }

  1717. 

  1718.     if (lumaSharpen != 0.0) {

  1719.         SwsVector *id = sws_getIdentityVec();

  1720.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1721.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1722.         sws_addVec(filter->lumH, id);

  1723.         sws_addVec(filter->lumV, id);

  1724.         sws_freeVec(id);

  1725.     }

  1726. 

  1727.     if (chromaHShift != 0.0)

  1728.         sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));

  1729. 

  1730.     if (chromaVShift != 0.0)

  1731.         sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));

  1732. 

  1733.     sws_normalizeVec(filter->chrH, 1.0);

  1734.     sws_normalizeVec(filter->chrV, 1.0);

  1735.     sws_normalizeVec(filter->lumH, 1.0);

  1736.     sws_normalizeVec(filter->lumV, 1.0);

  1737. 

  1738.     if (verbose)

  1739.         sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1740.     if (verbose)

  1741.         sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1742. 

  1743.     return filter;

  1744. }

  1745. 

  1746. SwsVector *sws_allocVec(int length)

  1747. {

  1748.     SwsVector *vec;

  1749. 

  1750.     if(length <= 0 || length > INT_MAX/ sizeof(double))

  1751.         return NULL;

  1752. 

  1753.     vec = av_malloc(sizeof(SwsVector));

  1754.     if (!vec)

  1755.         return NULL;

  1756.     vec->length = length;

  1757.     vec->coeff  = av_malloc(sizeof(double) * length);

  1758.     if (!vec->coeff)

  1759.         av_freep(&vec);

  1760.     return vec;

  1761. }

  1762. 

  1763. SwsVector *sws_getGaussianVec(double variance, double quality)

  1764. {

  1765.     const int length = (int)(variance * quality + 0.5) | 1;

  1766.     int i;

  1767.     double middle  = (length - 1) * 0.5;

  1768.     SwsVector *vec;

  1769. 

  1770.     if(variance < 0 || quality < 0)

  1771.         return NULL;

  1772. 

  1773.     vec = sws_allocVec(length);

  1774. 

  1775.     if (!vec)

  1776.         return NULL;

  1777. 

  1778.     for (i = 0; i < length; i++) {

  1779.         double dist = i - middle;

  1780.         vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /

  1781.                         sqrt(2 * variance * M_PI);

  1782.     }

  1783. 

  1784.     sws_normalizeVec(vec, 1.0);

  1785. 

  1786.     return vec;

  1787. }

  1788. 

  1789. SwsVector *sws_getConstVec(double c, int length)

  1790. {

  1791.     int i;

  1792.     SwsVector *vec = sws_allocVec(length);

  1793. 

  1794.     if (!vec)

  1795.         return NULL;

  1796. 

  1797.     for (i = 0; i < length; i++)

  1798.         vec->coeff[i] = c;

  1799. 

  1800.     return vec;

  1801. }

  1802. 

  1803. SwsVector *sws_getIdentityVec(void)

  1804. {

  1805.     return sws_getConstVec(1.0, 1);

  1806. }

  1807. 

  1808. static double sws_dcVec(SwsVector *a)

  1809. {

  1810.     int i;

  1811.     double sum = 0;

  1812. 

  1813.     for (i = 0; i < a->length; i++)

  1814.         sum += a->coeff[i];

  1815. 

  1816.     return sum;

  1817. }

  1818. 

  1819. void sws_scaleVec(SwsVector *a, double scalar)

  1820. {

  1821.     int i;

  1822. 

  1823.     for (i = 0; i < a->length; i++)

  1824.         a->coeff[i] *= scalar;

  1825. }

  1826. 

  1827. void sws_normalizeVec(SwsVector *a, double height)

  1828. {

  1829.     sws_scaleVec(a, height / sws_dcVec(a));

  1830. }

  1831. 

  1832. static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)

  1833. {

  1834.     int length = a->length + b->length - 1;

  1835.     int i, j;

  1836.     SwsVector *vec = sws_getConstVec(0.0, length);

  1837. 

  1838.     if (!vec)

  1839.         return NULL;

  1840. 

  1841.     for (i = 0; i < a->length; i++) {

  1842.         for (j = 0; j < b->length; j++) {

  1843.             vec->coeff[i + j] += a->coeff[i] * b->coeff[j];

  1844.         }

  1845.     }

  1846. 

  1847.     return vec;

  1848. }

  1849. 

  1850. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  1851. {

  1852.     int length = FFMAX(a->length, b->length);

  1853.     int i;

  1854.     SwsVector *vec = sws_getConstVec(0.0, length);

  1855. 

  1856.     if (!vec)

  1857.         return NULL;

  1858. 

  1859.     for (i = 0; i < a->length; i++)

  1860.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1861.     for (i = 0; i < b->length; i++)

  1862.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];

  1863. 

  1864.     return vec;

  1865. }

  1866. 

  1867. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  1868. {

  1869.     int length = FFMAX(a->length, b->length);

  1870.     int i;

  1871.     SwsVector *vec = sws_getConstVec(0.0, length);

  1872. 

  1873.     if (!vec)

  1874.         return NULL;

  1875. 

  1876.     for (i = 0; i < a->length; i++)

  1877.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1878.     for (i = 0; i < b->length; i++)

  1879.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];

  1880. 

  1881.     return vec;

  1882. }

  1883. 

  1884. /* shift left / or right if "shift" is negative */

  1885. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  1886. {

  1887.     int length = a->length + FFABS(shift) * 2;

  1888.     int i;

  1889.     SwsVector *vec = sws_getConstVec(0.0, length);

  1890. 

  1891.     if (!vec)

  1892.         return NULL;

  1893. 

  1894.     for (i = 0; i < a->length; i++) {

  1895.         vec->coeff[i + (length    - 1) / 2 -

  1896.                        (a->length - 1) / 2 - shift] = a->coeff[i];

  1897.     }

  1898. 

  1899.     return vec;

  1900. }

  1901. 

  1902. void sws_shiftVec(SwsVector *a, int shift)

  1903. {

  1904.     SwsVector *shifted = sws_getShiftedVec(a, shift);

  1905.     av_free(a->coeff);

  1906.     a->coeff  = shifted->coeff;

  1907.     a->length = shifted->length;

  1908.     av_free(shifted);

  1909. }

  1910. 

  1911. void sws_addVec(SwsVector *a, SwsVector *b)

  1912. {

  1913.     SwsVector *sum = sws_sumVec(a, b);

  1914.     av_free(a->coeff);

  1915.     a->coeff  = sum->coeff;

  1916.     a->length = sum->length;

  1917.     av_free(sum);

  1918. }

  1919. 

  1920. void sws_subVec(SwsVector *a, SwsVector *b)

  1921. {

  1922.     SwsVector *diff = sws_diffVec(a, b);

  1923.     av_free(a->coeff);

  1924.     a->coeff  = diff->coeff;

  1925.     a->length = diff->length;

  1926.     av_free(diff);

  1927. }

  1928. 

  1929. void sws_convVec(SwsVector *a, SwsVector *b)

  1930. {

  1931.     SwsVector *conv = sws_getConvVec(a, b);

  1932.     av_free(a->coeff);

  1933.     a->coeff  = conv->coeff;

  1934.     a->length = conv->length;

  1935.     av_free(conv);

  1936. }

  1937. 

  1938. SwsVector *sws_cloneVec(SwsVector *a)

  1939. {

  1940.     SwsVector *vec = sws_allocVec(a->length);

  1941. 

  1942.     if (!vec)

  1943.         return NULL;

  1944. 

  1945.     memcpy(vec->coeff, a->coeff, a->length * sizeof(*a->coeff));

  1946. 

  1947.     return vec;

  1948. }

  1949. 

  1950. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  1951. {

  1952.     int i;

  1953.     double max = 0;

  1954.     double min = 0;

  1955.     double range;

  1956. 

  1957.     for (i = 0; i < a->length; i++)

  1958.         if (a->coeff[i] > max)

  1959.             max = a->coeff[i];

  1960. 

  1961.     for (i = 0; i < a->length; i++)

  1962.         if (a->coeff[i] < min)

  1963.             min = a->coeff[i];

  1964. 

  1965.     range = max - min;

  1966. 

  1967.     for (i = 0; i < a->length; i++) {

  1968.         int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);

  1969.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  1970.         for (; x > 0; x--)

  1971.             av_log(log_ctx, log_level, " ");

  1972.         av_log(log_ctx, log_level, "|\n");

  1973.     }

  1974. }

  1975. 

  1976. void sws_freeVec(SwsVector *a)

  1977. {

  1978.     if (!a)

  1979.         return;

  1980.     av_freep(&a->coeff);

  1981.     a->length = 0;

  1982.     av_free(a);

  1983. }

  1984. 

  1985. void sws_freeFilter(SwsFilter *filter)

  1986. {

  1987.     if (!filter)

  1988.         return;

  1989. 

  1990.     sws_freeVec(filter->lumH);

  1991.     sws_freeVec(filter->lumV);

  1992.     sws_freeVec(filter->chrH);

  1993.     sws_freeVec(filter->chrV);

  1994.     av_free(filter);

  1995. }

  1996. 

  1997. void sws_freeContext(SwsContext *c)

  1998. {

  1999.     int i;

  2000.     if (!c)

  2001.         return;

  2002. 

  2003.     if (c->lumPixBuf) {

  2004.         for (i = 0; i < c->vLumBufSize; i++)

  2005.             av_freep(&c->lumPixBuf[i]);

  2006.         av_freep(&c->lumPixBuf);

  2007.     }

  2008. 

  2009.     if (c->chrUPixBuf) {

  2010.         for (i = 0; i < c->vChrBufSize; i++)

  2011.             av_freep(&c->chrUPixBuf[i]);

  2012.         av_freep(&c->chrUPixBuf);

  2013.         av_freep(&c->chrVPixBuf);

  2014.     }

  2015. 

  2016.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  2017.         for (i = 0; i < c->vLumBufSize; i++)

  2018.             av_freep(&c->alpPixBuf[i]);

  2019.         av_freep(&c->alpPixBuf);

  2020.     }

  2021. 

  2022.     for (i = 0; i < 4; i++)

  2023.         av_freep(&c->dither_error[i]);

  2024. 

  2025.     av_freep(&c->vLumFilter);

  2026.     av_freep(&c->vChrFilter);

  2027.     av_freep(&c->hLumFilter);

  2028.     av_freep(&c->hChrFilter);

  2029. #if HAVE_ALTIVEC

  2030.     av_freep(&c->vYCoeffsBank);

  2031.     av_freep(&c->vCCoeffsBank);

  2032. #endif

  2033. 

  2034.     av_freep(&c->vLumFilterPos);

  2035.     av_freep(&c->vChrFilterPos);

  2036.     av_freep(&c->hLumFilterPos);

  2037.     av_freep(&c->hChrFilterPos);

  2038. 

  2039. #if HAVE_MMX_INLINE

  2040. #if USE_MMAP

  2041.     if (c->lumMmxextFilterCode)

  2042.         munmap(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize);

  2043.     if (c->chrMmxextFilterCode)

  2044.         munmap(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize);

  2045. #elif HAVE_VIRTUALALLOC

  2046.     if (c->lumMmxextFilterCode)

  2047.         VirtualFree(c->lumMmxextFilterCode, 0, MEM_RELEASE);

  2048.     if (c->chrMmxextFilterCode)

  2049.         VirtualFree(c->chrMmxextFilterCode, 0, MEM_RELEASE);

  2050. #else

  2051.     av_free(c->lumMmxextFilterCode);

  2052.     av_free(c->chrMmxextFilterCode);

  2053. #endif

  2054.     c->lumMmxextFilterCode = NULL;

  2055.     c->chrMmxextFilterCode = NULL;

  2056. #endif /* HAVE_MMX_INLINE */

  2057. 

  2058.     av_freep(&c->yuvTable);

  2059.     av_freep(&c->formatConvBuffer);

  2060. 

  2061.     av_free(c);

  2062. }

  2063. 

  2064. struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,

  2065.                                         int srcH, enum AVPixelFormat srcFormat,

  2066.                                         int dstW, int dstH,

  2067.                                         enum AVPixelFormat dstFormat, int flags,

  2068.                                         SwsFilter *srcFilter,

  2069.                                         SwsFilter *dstFilter,

  2070.                                         const double *param)

  2071. {

  2072.     static const double default_param[2] = { SWS_PARAM_DEFAULT,

  2073.                                              SWS_PARAM_DEFAULT };

  2074. 

  2075.     if (!param)

  2076.         param = default_param;

  2077. 

  2078.     if (context &&

  2079.         (context->srcW      != srcW      ||

  2080.          context->srcH      != srcH      ||

  2081.          context->srcFormat != srcFormat ||

  2082.          context->dstW      != dstW      ||

  2083.          context->dstH      != dstH      ||

  2084.          context->dstFormat != dstFormat ||

  2085.          context->flags     != flags     ||

  2086.          context->param[0]  != param[0]  ||

  2087.          context->param[1]  != param[1])) {

  2088.         sws_freeContext(context);

  2089.         context = NULL;

  2090.     }

  2091. 

  2092.     if (!context) {

  2093.         if (!(context = sws_alloc_context()))

  2094.             return NULL;

  2095.         context->srcW      = srcW;

  2096.         context->srcH      = srcH;

  2097.         context->srcFormat = srcFormat;

  2098.         context->dstW      = dstW;

  2099.         context->dstH      = dstH;

  2100.         context->dstFormat = dstFormat;

  2101.         context->flags     = flags;

  2102.         context->param[0]  = param[0];

  2103.         context->param[1]  = param[1];

  2104.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  2105.             sws_freeContext(context);

  2106.             return NULL;

  2107.         }

  2108.     }

  2109.     return context;

  2110. }